propset svn:eol-style native

git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@146 1a98c847-1fd6-4fd8-948a-caf3550aa51b

1 files changed, 532 insertions, 532 deletions

diff --git a/bignum.h b/bignum.h
index 0701f7930f..450e809d3d 100644
--- a/bignum.h
+++ b/bignum.h
@@ -1,532 +1,532 @@
-// Copyright (c) 2009-2010 Satoshi Nakamoto

-// Distributed under the MIT/X11 software license, see the accompanying

-// file license.txt or http://www.opensource.org/licenses/mit-license.php.

-

-#include <stdexcept>

-#include <vector>

-#include <openssl/bn.h>

-

-

-

-

-

-class bignum_error : public std::runtime_error

-{

-public:

-    explicit bignum_error(const std::string& str) : std::runtime_error(str) {}

-};

-

-

-

-class CAutoBN_CTX

-{

-protected:

-    BN_CTX* pctx;

-    BN_CTX* operator=(BN_CTX* pnew) { return pctx = pnew; }

-

-public:

-    CAutoBN_CTX()

-    {

-        pctx = BN_CTX_new();

-        if (pctx == NULL)

-            throw bignum_error("CAutoBN_CTX : BN_CTX_new() returned NULL");

-    }

-

-    ~CAutoBN_CTX()

-    {

-        if (pctx != NULL)

-            BN_CTX_free(pctx);

-    }

-

-    operator BN_CTX*() { return pctx; }

-    BN_CTX& operator*() { return *pctx; }

-    BN_CTX** operator&() { return &pctx; }

-    bool operator!() { return (pctx == NULL); }

-};

-

-

-

-class CBigNum : public BIGNUM

-{

-public:

-    CBigNum()

-    {

-        BN_init(this);

-    }

-

-    CBigNum(const CBigNum& b)

-    {

-        BN_init(this);

-        if (!BN_copy(this, &b))

-        {

-            BN_clear_free(this);

-            throw bignum_error("CBigNum::CBigNum(const CBigNum&) : BN_copy failed");

-        }

-    }

-

-    CBigNum& operator=(const CBigNum& b)

-    {

-        if (!BN_copy(this, &b))

-            throw bignum_error("CBigNum::operator= : BN_copy failed");

-        return (*this);

-    }

-

-    ~CBigNum()

-    {

-        BN_clear_free(this);

-    }

-

-    CBigNum(char n)             { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }

-    CBigNum(short n)            { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }

-    CBigNum(int n)              { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }

-    CBigNum(long n)             { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }

-    CBigNum(int64 n)            { BN_init(this); setint64(n); }

-    CBigNum(unsigned char n)    { BN_init(this); setulong(n); }

-    CBigNum(unsigned short n)   { BN_init(this); setulong(n); }

-    CBigNum(unsigned int n)     { BN_init(this); setulong(n); }

-    CBigNum(unsigned long n)    { BN_init(this); setulong(n); }

-    CBigNum(uint64 n)           { BN_init(this); setuint64(n); }

-    explicit CBigNum(uint256 n) { BN_init(this); setuint256(n); }

-

-    explicit CBigNum(const std::vector<unsigned char>& vch)

-    {

-        BN_init(this);

-        setvch(vch);

-    }

-

-    void setulong(unsigned long n)

-    {

-        if (!BN_set_word(this, n))

-            throw bignum_error("CBigNum conversion from unsigned long : BN_set_word failed");

-    }

-

-    unsigned long getulong() const

-    {

-        return BN_get_word(this);

-    }

-

-    unsigned int getuint() const

-    {

-        return BN_get_word(this);

-    }

-

-    int getint() const

-    {

-        unsigned long n = BN_get_word(this);

-        if (!BN_is_negative(this))

-            return (n > INT_MAX ? INT_MAX : n);

-        else

-            return (n > INT_MAX ? INT_MIN : -(int)n);

-    }

-

-    void setint64(int64 n)

-    {

-        unsigned char pch[sizeof(n) + 6];

-        unsigned char* p = pch + 4;

-        bool fNegative = false;

-        if (n < (int64)0)

-        {

-            n = -n;

-            fNegative = true;

-        }

-        bool fLeadingZeroes = true;

-        for (int i = 0; i < 8; i++)

-        {

-            unsigned char c = (n >> 56) & 0xff;

-            n <<= 8;

-            if (fLeadingZeroes)

-            {

-                if (c == 0)

-                    continue;

-                if (c & 0x80)

-                    *p++ = (fNegative ? 0x80 : 0);

-                else if (fNegative)

-                    c |= 0x80;

-                fLeadingZeroes = false;

-            }

-            *p++ = c;

-        }

-        unsigned int nSize = p - (pch + 4);

-        pch[0] = (nSize >> 24) & 0xff;

-        pch[1] = (nSize >> 16) & 0xff;

-        pch[2] = (nSize >> 8) & 0xff;

-        pch[3] = (nSize) & 0xff;

-        BN_mpi2bn(pch, p - pch, this);

-    }

-

-    void setuint64(uint64 n)

-    {

-        unsigned char pch[sizeof(n) + 6];

-        unsigned char* p = pch + 4;

-        bool fLeadingZeroes = true;

-        for (int i = 0; i < 8; i++)

-        {

-            unsigned char c = (n >> 56) & 0xff;

-            n <<= 8;

-            if (fLeadingZeroes)

-            {

-                if (c == 0)

-                    continue;

-                if (c & 0x80)

-                    *p++ = 0;

-                fLeadingZeroes = false;

-            }

-            *p++ = c;

-        }

-        unsigned int nSize = p - (pch + 4);

-        pch[0] = (nSize >> 24) & 0xff;

-        pch[1] = (nSize >> 16) & 0xff;

-        pch[2] = (nSize >> 8) & 0xff;

-        pch[3] = (nSize) & 0xff;

-        BN_mpi2bn(pch, p - pch, this);

-    }

-

-    void setuint256(uint256 n)

-    {

-        unsigned char pch[sizeof(n) + 6];

-        unsigned char* p = pch + 4;

-        bool fLeadingZeroes = true;

-        unsigned char* pbegin = (unsigned char*)&n;

-        unsigned char* psrc = pbegin + sizeof(n);

-        while (psrc != pbegin)

-        {

-            unsigned char c = *(--psrc);

-            if (fLeadingZeroes)

-            {

-                if (c == 0)

-                    continue;

-                if (c & 0x80)

-                    *p++ = 0;

-                fLeadingZeroes = false;

-            }

-            *p++ = c;

-        }

-        unsigned int nSize = p - (pch + 4);

-        pch[0] = (nSize >> 24) & 0xff;

-        pch[1] = (nSize >> 16) & 0xff;

-        pch[2] = (nSize >> 8) & 0xff;

-        pch[3] = (nSize >> 0) & 0xff;

-        BN_mpi2bn(pch, p - pch, this);

-    }

-

-    uint256 getuint256()

-    {

-        unsigned int nSize = BN_bn2mpi(this, NULL);

-        if (nSize < 4)

-            return 0;

-        std::vector<unsigned char> vch(nSize);

-        BN_bn2mpi(this, &vch[0]);

-        if (vch.size() > 4)

-            vch[4] &= 0x7f;

-        uint256 n = 0;

-        for (int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)

-            ((unsigned char*)&n)[i] = vch[j];

-        return n;

-    }

-

-    void setvch(const std::vector<unsigned char>& vch)

-    {

-        std::vector<unsigned char> vch2(vch.size() + 4);

-        unsigned int nSize = vch.size();

-        vch2[0] = (nSize >> 24) & 0xff;

-        vch2[1] = (nSize >> 16) & 0xff;

-        vch2[2] = (nSize >> 8) & 0xff;

-        vch2[3] = (nSize >> 0) & 0xff;

-        reverse_copy(vch.begin(), vch.end(), vch2.begin() + 4);

-        BN_mpi2bn(&vch2[0], vch2.size(), this);

-    }

-

-    std::vector<unsigned char> getvch() const

-    {

-        unsigned int nSize = BN_bn2mpi(this, NULL);

-        if (nSize < 4)

-            return std::vector<unsigned char>();

-        std::vector<unsigned char> vch(nSize);

-        BN_bn2mpi(this, &vch[0]);

-        vch.erase(vch.begin(), vch.begin() + 4);

-        reverse(vch.begin(), vch.end());

-        return vch;

-    }

-

-    CBigNum& SetCompact(unsigned int nCompact)

-    {

-        unsigned int nSize = nCompact >> 24;

-        std::vector<unsigned char> vch(4 + nSize);

-        vch[3] = nSize;

-        if (nSize >= 1) vch[4] = (nCompact >> 16) & 0xff;

-        if (nSize >= 2) vch[5] = (nCompact >> 8) & 0xff;

-        if (nSize >= 3) vch[6] = (nCompact >> 0) & 0xff;

-        BN_mpi2bn(&vch[0], vch.size(), this);

-        return *this;

-    }

-

-    unsigned int GetCompact() const

-    {

-        unsigned int nSize = BN_bn2mpi(this, NULL);

-        std::vector<unsigned char> vch(nSize);

-        nSize -= 4;

-        BN_bn2mpi(this, &vch[0]);

-        unsigned int nCompact = nSize << 24;

-        if (nSize >= 1) nCompact |= (vch[4] << 16);

-        if (nSize >= 2) nCompact |= (vch[5] << 8);

-        if (nSize >= 3) nCompact |= (vch[6] << 0);

-        return nCompact;

-    }

-

-    void SetHex(const std::string& str)

-    {

-        // skip 0x

-        const char* psz = str.c_str();

-        while (isspace(*psz))

-            psz++;

-        bool fNegative = false;

-        if (*psz == '-')

-        {

-            fNegative = true;

-            psz++;

-        }

-        if (psz[0] == '0' && tolower(psz[1]) == 'x')

-            psz += 2;

-        while (isspace(*psz))

-            psz++;

-

-        // hex string to bignum

-        static char phexdigit[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0 };

-        *this = 0;

-        while (isxdigit(*psz))

-        {

-            *this <<= 4;

-            int n = phexdigit[*psz++];

-            *this += n;

-        }

-        if (fNegative)

-            *this = 0 - *this;

-    }

-

-    std::string ToString(int nBase=10) const

-    {

-        CAutoBN_CTX pctx;

-        CBigNum bnBase = nBase;

-        CBigNum bn0 = 0;

-        string str;

-        CBigNum bn = *this;

-        BN_set_negative(&bn, false);

-        CBigNum dv;

-        CBigNum rem;

-        if (BN_cmp(&bn, &bn0) == 0)

-            return "0";

-        while (BN_cmp(&bn, &bn0) > 0)

-        {

-            if (!BN_div(&dv, &rem, &bn, &bnBase, pctx))

-                throw bignum_error("CBigNum::ToString() : BN_div failed");

-            bn = dv;

-            unsigned int c = rem.getulong();

-            str += "0123456789abcdef"[c];

-        }

-        if (BN_is_negative(this))

-            str += "-";

-        reverse(str.begin(), str.end());

-        return str;

-    }

-

-    std::string GetHex() const

-    {

-        return ToString(16);

-    }

-

-    unsigned int GetSerializeSize(int nType=0, int nVersion=VERSION) const

-    {

-        return ::GetSerializeSize(getvch(), nType, nVersion);

-    }

-

-    template<typename Stream>

-    void Serialize(Stream& s, int nType=0, int nVersion=VERSION) const

-    {

-        ::Serialize(s, getvch(), nType, nVersion);

-    }

-

-    template<typename Stream>

-    void Unserialize(Stream& s, int nType=0, int nVersion=VERSION)

-    {

-        vector<unsigned char> vch;

-        ::Unserialize(s, vch, nType, nVersion);

-        setvch(vch);

-    }

-

-

-    bool operator!() const

-    {

-        return BN_is_zero(this);

-    }

-

-    CBigNum& operator+=(const CBigNum& b)

-    {

-        if (!BN_add(this, this, &b))

-            throw bignum_error("CBigNum::operator+= : BN_add failed");

-        return *this;

-    }

-

-    CBigNum& operator-=(const CBigNum& b)

-    {

-        *this = *this - b;

-        return *this;

-    }

-

-    CBigNum& operator*=(const CBigNum& b)

-    {

-        CAutoBN_CTX pctx;

-        if (!BN_mul(this, this, &b, pctx))

-            throw bignum_error("CBigNum::operator*= : BN_mul failed");

-        return *this;

-    }

-

-    CBigNum& operator/=(const CBigNum& b)

-    {

-        *this = *this / b;

-        return *this;

-    }

-

-    CBigNum& operator%=(const CBigNum& b)

-    {

-        *this = *this % b;

-        return *this;

-    }

-

-    CBigNum& operator<<=(unsigned int shift)

-    {

-        if (!BN_lshift(this, this, shift))

-            throw bignum_error("CBigNum:operator<<= : BN_lshift failed");

-        return *this;

-    }

-

-    CBigNum& operator>>=(unsigned int shift)

-    {

-        // Note: BN_rshift segfaults on 64-bit if 2^shift is greater than the number

-        //   if built on ubuntu 9.04 or 9.10, probably depends on version of openssl

-        CBigNum a = 1;

-        a <<= shift;

-        if (BN_cmp(&a, this) > 0)

-        {

-            *this = 0;

-            return *this;

-        }

-

-        if (!BN_rshift(this, this, shift))

-            throw bignum_error("CBigNum:operator>>= : BN_rshift failed");

-        return *this;

-    }

-

-

-    CBigNum& operator++()

-    {

-        // prefix operator

-        if (!BN_add(this, this, BN_value_one()))

-            throw bignum_error("CBigNum::operator++ : BN_add failed");

-        return *this;

-    }

-

-    const CBigNum operator++(int)

-    {

-        // postfix operator

-        const CBigNum ret = *this;

-        ++(*this);

-        return ret;

-    }

-

-    CBigNum& operator--()

-    {

-        // prefix operator

-        CBigNum r;

-        if (!BN_sub(&r, this, BN_value_one()))

-            throw bignum_error("CBigNum::operator-- : BN_sub failed");

-        *this = r;

-        return *this;

-    }

-

-    const CBigNum operator--(int)

-    {

-        // postfix operator

-        const CBigNum ret = *this;

-        --(*this);

-        return ret;

-    }

-

-

-    friend inline const CBigNum operator-(const CBigNum& a, const CBigNum& b);

-    friend inline const CBigNum operator/(const CBigNum& a, const CBigNum& b);

-    friend inline const CBigNum operator%(const CBigNum& a, const CBigNum& b);

-};

-

-

-

-inline const CBigNum operator+(const CBigNum& a, const CBigNum& b)

-{

-    CBigNum r;

-    if (!BN_add(&r, &a, &b))

-        throw bignum_error("CBigNum::operator+ : BN_add failed");

-    return r;

-}

-

-inline const CBigNum operator-(const CBigNum& a, const CBigNum& b)

-{

-    CBigNum r;

-    if (!BN_sub(&r, &a, &b))

-        throw bignum_error("CBigNum::operator- : BN_sub failed");

-    return r;

-}

-

-inline const CBigNum operator-(const CBigNum& a)

-{

-    CBigNum r(a);

-    BN_set_negative(&r, !BN_is_negative(&r));

-    return r;

-}

-

-inline const CBigNum operator*(const CBigNum& a, const CBigNum& b)

-{

-    CAutoBN_CTX pctx;

-    CBigNum r;

-    if (!BN_mul(&r, &a, &b, pctx))

-        throw bignum_error("CBigNum::operator* : BN_mul failed");

-    return r;

-}

-

-inline const CBigNum operator/(const CBigNum& a, const CBigNum& b)

-{

-    CAutoBN_CTX pctx;

-    CBigNum r;

-    if (!BN_div(&r, NULL, &a, &b, pctx))

-        throw bignum_error("CBigNum::operator/ : BN_div failed");

-    return r;

-}

-

-inline const CBigNum operator%(const CBigNum& a, const CBigNum& b)

-{

-    CAutoBN_CTX pctx;

-    CBigNum r;

-    if (!BN_mod(&r, &a, &b, pctx))

-        throw bignum_error("CBigNum::operator% : BN_div failed");

-    return r;

-}

-

-inline const CBigNum operator<<(const CBigNum& a, unsigned int shift)

-{

-    CBigNum r;

-    if (!BN_lshift(&r, &a, shift))

-        throw bignum_error("CBigNum:operator<< : BN_lshift failed");

-    return r;

-}

-

-inline const CBigNum operator>>(const CBigNum& a, unsigned int shift)

-{

-    CBigNum r = a;

-    r >>= shift;

-    return r;

-}

-

-inline bool operator==(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) == 0); }

-inline bool operator!=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) != 0); }

-inline bool operator<=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) <= 0); }

-inline bool operator>=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) >= 0); }

-inline bool operator<(const CBigNum& a, const CBigNum& b)  { return (BN_cmp(&a, &b) < 0); }

-inline bool operator>(const CBigNum& a, const CBigNum& b)  { return (BN_cmp(&a, &b) > 0); }

+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+#include <stdexcept>
+#include <vector>
+#include <openssl/bn.h>
+
+
+
+
+
+class bignum_error : public std::runtime_error
+{
+public:
+    explicit bignum_error(const std::string& str) : std::runtime_error(str) {}
+};
+
+
+
+class CAutoBN_CTX
+{
+protected:
+    BN_CTX* pctx;
+    BN_CTX* operator=(BN_CTX* pnew) { return pctx = pnew; }
+
+public:
+    CAutoBN_CTX()
+    {
+        pctx = BN_CTX_new();
+        if (pctx == NULL)
+            throw bignum_error("CAutoBN_CTX : BN_CTX_new() returned NULL");
+    }
+
+    ~CAutoBN_CTX()
+    {
+        if (pctx != NULL)
+            BN_CTX_free(pctx);
+    }
+
+    operator BN_CTX*() { return pctx; }
+    BN_CTX& operator*() { return *pctx; }
+    BN_CTX** operator&() { return &pctx; }
+    bool operator!() { return (pctx == NULL); }
+};
+
+
+
+class CBigNum : public BIGNUM
+{
+public:
+    CBigNum()
+    {
+        BN_init(this);
+    }
+
+    CBigNum(const CBigNum& b)
+    {
+        BN_init(this);
+        if (!BN_copy(this, &b))
+        {
+            BN_clear_free(this);
+            throw bignum_error("CBigNum::CBigNum(const CBigNum&) : BN_copy failed");
+        }
+    }
+
+    CBigNum& operator=(const CBigNum& b)
+    {
+        if (!BN_copy(this, &b))
+            throw bignum_error("CBigNum::operator= : BN_copy failed");
+        return (*this);
+    }
+
+    ~CBigNum()
+    {
+        BN_clear_free(this);
+    }
+
+    CBigNum(char n)             { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+    CBigNum(short n)            { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+    CBigNum(int n)              { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+    CBigNum(long n)             { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+    CBigNum(int64 n)            { BN_init(this); setint64(n); }
+    CBigNum(unsigned char n)    { BN_init(this); setulong(n); }
+    CBigNum(unsigned short n)   { BN_init(this); setulong(n); }
+    CBigNum(unsigned int n)     { BN_init(this); setulong(n); }
+    CBigNum(unsigned long n)    { BN_init(this); setulong(n); }
+    CBigNum(uint64 n)           { BN_init(this); setuint64(n); }
+    explicit CBigNum(uint256 n) { BN_init(this); setuint256(n); }
+
+    explicit CBigNum(const std::vector<unsigned char>& vch)
+    {
+        BN_init(this);
+        setvch(vch);
+    }
+
+    void setulong(unsigned long n)
+    {
+        if (!BN_set_word(this, n))
+            throw bignum_error("CBigNum conversion from unsigned long : BN_set_word failed");
+    }
+
+    unsigned long getulong() const
+    {
+        return BN_get_word(this);
+    }
+
+    unsigned int getuint() const
+    {
+        return BN_get_word(this);
+    }
+
+    int getint() const
+    {
+        unsigned long n = BN_get_word(this);
+        if (!BN_is_negative(this))
+            return (n > INT_MAX ? INT_MAX : n);
+        else
+            return (n > INT_MAX ? INT_MIN : -(int)n);
+    }
+
+    void setint64(int64 n)
+    {
+        unsigned char pch[sizeof(n) + 6];
+        unsigned char* p = pch + 4;
+        bool fNegative = false;
+        if (n < (int64)0)
+        {
+            n = -n;
+            fNegative = true;
+        }
+        bool fLeadingZeroes = true;
+        for (int i = 0; i < 8; i++)
+        {
+            unsigned char c = (n >> 56) & 0xff;
+            n <<= 8;
+            if (fLeadingZeroes)
+            {
+                if (c == 0)
+                    continue;
+                if (c & 0x80)
+                    *p++ = (fNegative ? 0x80 : 0);
+                else if (fNegative)
+                    c |= 0x80;
+                fLeadingZeroes = false;
+            }
+            *p++ = c;
+        }
+        unsigned int nSize = p - (pch + 4);
+        pch[0] = (nSize >> 24) & 0xff;
+        pch[1] = (nSize >> 16) & 0xff;
+        pch[2] = (nSize >> 8) & 0xff;
+        pch[3] = (nSize) & 0xff;
+        BN_mpi2bn(pch, p - pch, this);
+    }
+
+    void setuint64(uint64 n)
+    {
+        unsigned char pch[sizeof(n) + 6];
+        unsigned char* p = pch + 4;
+        bool fLeadingZeroes = true;
+        for (int i = 0; i < 8; i++)
+        {
+            unsigned char c = (n >> 56) & 0xff;
+            n <<= 8;
+            if (fLeadingZeroes)
+            {
+                if (c == 0)
+                    continue;
+                if (c & 0x80)
+                    *p++ = 0;
+                fLeadingZeroes = false;
+            }
+            *p++ = c;
+        }
+        unsigned int nSize = p - (pch + 4);
+        pch[0] = (nSize >> 24) & 0xff;
+        pch[1] = (nSize >> 16) & 0xff;
+        pch[2] = (nSize >> 8) & 0xff;
+        pch[3] = (nSize) & 0xff;
+        BN_mpi2bn(pch, p - pch, this);
+    }
+
+    void setuint256(uint256 n)
+    {
+        unsigned char pch[sizeof(n) + 6];
+        unsigned char* p = pch + 4;
+        bool fLeadingZeroes = true;
+        unsigned char* pbegin = (unsigned char*)&n;
+        unsigned char* psrc = pbegin + sizeof(n);
+        while (psrc != pbegin)
+        {
+            unsigned char c = *(--psrc);
+            if (fLeadingZeroes)
+            {
+                if (c == 0)
+                    continue;
+                if (c & 0x80)
+                    *p++ = 0;
+                fLeadingZeroes = false;
+            }
+            *p++ = c;
+        }
+        unsigned int nSize = p - (pch + 4);
+        pch[0] = (nSize >> 24) & 0xff;
+        pch[1] = (nSize >> 16) & 0xff;
+        pch[2] = (nSize >> 8) & 0xff;
+        pch[3] = (nSize >> 0) & 0xff;
+        BN_mpi2bn(pch, p - pch, this);
+    }
+
+    uint256 getuint256()
+    {
+        unsigned int nSize = BN_bn2mpi(this, NULL);
+        if (nSize < 4)
+            return 0;
+        std::vector<unsigned char> vch(nSize);
+        BN_bn2mpi(this, &vch[0]);
+        if (vch.size() > 4)
+            vch[4] &= 0x7f;
+        uint256 n = 0;
+        for (int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)
+            ((unsigned char*)&n)[i] = vch[j];
+        return n;
+    }
+
+    void setvch(const std::vector<unsigned char>& vch)
+    {
+        std::vector<unsigned char> vch2(vch.size() + 4);
+        unsigned int nSize = vch.size();
+        vch2[0] = (nSize >> 24) & 0xff;
+        vch2[1] = (nSize >> 16) & 0xff;
+        vch2[2] = (nSize >> 8) & 0xff;
+        vch2[3] = (nSize >> 0) & 0xff;
+        reverse_copy(vch.begin(), vch.end(), vch2.begin() + 4);
+        BN_mpi2bn(&vch2[0], vch2.size(), this);
+    }
+
+    std::vector<unsigned char> getvch() const
+    {
+        unsigned int nSize = BN_bn2mpi(this, NULL);
+        if (nSize < 4)
+            return std::vector<unsigned char>();
+        std::vector<unsigned char> vch(nSize);
+        BN_bn2mpi(this, &vch[0]);
+        vch.erase(vch.begin(), vch.begin() + 4);
+        reverse(vch.begin(), vch.end());
+        return vch;
+    }
+
+    CBigNum& SetCompact(unsigned int nCompact)
+    {
+        unsigned int nSize = nCompact >> 24;
+        std::vector<unsigned char> vch(4 + nSize);
+        vch[3] = nSize;
+        if (nSize >= 1) vch[4] = (nCompact >> 16) & 0xff;
+        if (nSize >= 2) vch[5] = (nCompact >> 8) & 0xff;
+        if (nSize >= 3) vch[6] = (nCompact >> 0) & 0xff;
+        BN_mpi2bn(&vch[0], vch.size(), this);
+        return *this;
+    }
+
+    unsigned int GetCompact() const
+    {
+        unsigned int nSize = BN_bn2mpi(this, NULL);
+        std::vector<unsigned char> vch(nSize);
+        nSize -= 4;
+        BN_bn2mpi(this, &vch[0]);
+        unsigned int nCompact = nSize << 24;
+        if (nSize >= 1) nCompact |= (vch[4] << 16);
+        if (nSize >= 2) nCompact |= (vch[5] << 8);
+        if (nSize >= 3) nCompact |= (vch[6] << 0);
+        return nCompact;
+    }
+
+    void SetHex(const std::string& str)
+    {
+        // skip 0x
+        const char* psz = str.c_str();
+        while (isspace(*psz))
+            psz++;
+        bool fNegative = false;
+        if (*psz == '-')
+        {
+            fNegative = true;
+            psz++;
+        }
+        if (psz[0] == '0' && tolower(psz[1]) == 'x')
+            psz += 2;
+        while (isspace(*psz))
+            psz++;
+
+        // hex string to bignum
+        static char phexdigit[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0 };
+        *this = 0;
+        while (isxdigit(*psz))
+        {
+            *this <<= 4;
+            int n = phexdigit[*psz++];
+            *this += n;
+        }
+        if (fNegative)
+            *this = 0 - *this;
+    }
+
+    std::string ToString(int nBase=10) const
+    {
+        CAutoBN_CTX pctx;
+        CBigNum bnBase = nBase;
+        CBigNum bn0 = 0;
+        string str;
+        CBigNum bn = *this;
+        BN_set_negative(&bn, false);
+        CBigNum dv;
+        CBigNum rem;
+        if (BN_cmp(&bn, &bn0) == 0)
+            return "0";
+        while (BN_cmp(&bn, &bn0) > 0)
+        {
+            if (!BN_div(&dv, &rem, &bn, &bnBase, pctx))
+                throw bignum_error("CBigNum::ToString() : BN_div failed");
+            bn = dv;
+            unsigned int c = rem.getulong();
+            str += "0123456789abcdef"[c];
+        }
+        if (BN_is_negative(this))
+            str += "-";
+        reverse(str.begin(), str.end());
+        return str;
+    }
+
+    std::string GetHex() const
+    {
+        return ToString(16);
+    }
+
+    unsigned int GetSerializeSize(int nType=0, int nVersion=VERSION) const
+    {
+        return ::GetSerializeSize(getvch(), nType, nVersion);
+    }
+
+    template<typename Stream>
+    void Serialize(Stream& s, int nType=0, int nVersion=VERSION) const
+    {
+        ::Serialize(s, getvch(), nType, nVersion);
+    }
+
+    template<typename Stream>
+    void Unserialize(Stream& s, int nType=0, int nVersion=VERSION)
+    {
+        vector<unsigned char> vch;
+        ::Unserialize(s, vch, nType, nVersion);
+        setvch(vch);
+    }
+
+
+    bool operator!() const
+    {
+        return BN_is_zero(this);
+    }
+
+    CBigNum& operator+=(const CBigNum& b)
+    {
+        if (!BN_add(this, this, &b))
+            throw bignum_error("CBigNum::operator+= : BN_add failed");
+        return *this;
+    }
+
+    CBigNum& operator-=(const CBigNum& b)
+    {
+        *this = *this - b;
+        return *this;
+    }
+
+    CBigNum& operator*=(const CBigNum& b)
+    {
+        CAutoBN_CTX pctx;
+        if (!BN_mul(this, this, &b, pctx))
+            throw bignum_error("CBigNum::operator*= : BN_mul failed");
+        return *this;
+    }
+
+    CBigNum& operator/=(const CBigNum& b)
+    {
+        *this = *this / b;
+        return *this;
+    }
+
+    CBigNum& operator%=(const CBigNum& b)
+    {
+        *this = *this % b;
+        return *this;
+    }
+
+    CBigNum& operator<<=(unsigned int shift)
+    {
+        if (!BN_lshift(this, this, shift))
+            throw bignum_error("CBigNum:operator<<= : BN_lshift failed");
+        return *this;
+    }
+
+    CBigNum& operator>>=(unsigned int shift)
+    {
+        // Note: BN_rshift segfaults on 64-bit if 2^shift is greater than the number
+        //   if built on ubuntu 9.04 or 9.10, probably depends on version of openssl
+        CBigNum a = 1;
+        a <<= shift;
+        if (BN_cmp(&a, this) > 0)
+        {
+            *this = 0;
+            return *this;
+        }
+
+        if (!BN_rshift(this, this, shift))
+            throw bignum_error("CBigNum:operator>>= : BN_rshift failed");
+        return *this;
+    }
+
+
+    CBigNum& operator++()
+    {
+        // prefix operator
+        if (!BN_add(this, this, BN_value_one()))
+            throw bignum_error("CBigNum::operator++ : BN_add failed");
+        return *this;
+    }
+
+    const CBigNum operator++(int)
+    {
+        // postfix operator
+        const CBigNum ret = *this;
+        ++(*this);
+        return ret;
+    }
+
+    CBigNum& operator--()
+    {
+        // prefix operator
+        CBigNum r;
+        if (!BN_sub(&r, this, BN_value_one()))
+            throw bignum_error("CBigNum::operator-- : BN_sub failed");
+        *this = r;
+        return *this;
+    }
+
+    const CBigNum operator--(int)
+    {
+        // postfix operator
+        const CBigNum ret = *this;
+        --(*this);
+        return ret;
+    }
+
+
+    friend inline const CBigNum operator-(const CBigNum& a, const CBigNum& b);
+    friend inline const CBigNum operator/(const CBigNum& a, const CBigNum& b);
+    friend inline const CBigNum operator%(const CBigNum& a, const CBigNum& b);
+};
+
+
+
+inline const CBigNum operator+(const CBigNum& a, const CBigNum& b)
+{
+    CBigNum r;
+    if (!BN_add(&r, &a, &b))
+        throw bignum_error("CBigNum::operator+ : BN_add failed");
+    return r;
+}
+
+inline const CBigNum operator-(const CBigNum& a, const CBigNum& b)
+{
+    CBigNum r;
+    if (!BN_sub(&r, &a, &b))
+        throw bignum_error("CBigNum::operator- : BN_sub failed");
+    return r;
+}
+
+inline const CBigNum operator-(const CBigNum& a)
+{
+    CBigNum r(a);
+    BN_set_negative(&r, !BN_is_negative(&r));
+    return r;
+}
+
+inline const CBigNum operator*(const CBigNum& a, const CBigNum& b)
+{
+    CAutoBN_CTX pctx;
+    CBigNum r;
+    if (!BN_mul(&r, &a, &b, pctx))
+        throw bignum_error("CBigNum::operator* : BN_mul failed");
+    return r;
+}
+
+inline const CBigNum operator/(const CBigNum& a, const CBigNum& b)
+{
+    CAutoBN_CTX pctx;
+    CBigNum r;
+    if (!BN_div(&r, NULL, &a, &b, pctx))
+        throw bignum_error("CBigNum::operator/ : BN_div failed");
+    return r;
+}
+
+inline const CBigNum operator%(const CBigNum& a, const CBigNum& b)
+{
+    CAutoBN_CTX pctx;
+    CBigNum r;
+    if (!BN_mod(&r, &a, &b, pctx))
+        throw bignum_error("CBigNum::operator% : BN_div failed");
+    return r;
+}
+
+inline const CBigNum operator<<(const CBigNum& a, unsigned int shift)
+{
+    CBigNum r;
+    if (!BN_lshift(&r, &a, shift))
+        throw bignum_error("CBigNum:operator<< : BN_lshift failed");
+    return r;
+}
+
+inline const CBigNum operator>>(const CBigNum& a, unsigned int shift)
+{
+    CBigNum r = a;
+    r >>= shift;
+    return r;
+}
+
+inline bool operator==(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) == 0); }
+inline bool operator!=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) != 0); }
+inline bool operator<=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) <= 0); }
+inline bool operator>=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) >= 0); }
+inline bool operator<(const CBigNum& a, const CBigNum& b)  { return (BN_cmp(&a, &b) < 0); }
+inline bool operator>(const CBigNum& a, const CBigNum& b)  { return (BN_cmp(&a, &b) > 0); }